Improvement in casings of hot-air furnaces



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IIa-sings nf Hot-Air Furnaces. N0.l47,279, Patented Feb.l0,1874.

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Patented lFeb UNITED STATES PATENT OFFICE.

JOHN MAGEE, or CHELSEA, MASsACHUSETTs, ASSIGNOE To THE MAGEE EUENACE COMPANY.`

IMPROVEMENT IN CASINGS OF HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 147,279, dated February 10, 1874; application tiled June 30, 1873.

To all whom it may concern:

Beit known that I, JOHN MAGEE, of Chelsea, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in the Casings of the Tops of Furnaces, Ste., of which the following is a full, clear, and exact description, reference being had to the accompanying drawings making part of this specification, in which- Figure l is a perspective view of a furnace having the easing of its top constructed in accordance with my invention. Fig. 2 is a vertical section through the center of the same. Fig. 3 is a horizontal section on the line x of Fig. 2.

My present invention consists in the top of the casing of a furnace provided with a series of panels, slabs, or sections capable of being removed and of being slid around within their frame to any desired point in order that a panel provided with an opening or thimble of the required size may be readily brought Vinto the proper position for connecting one of the hot-air conducting-pipes therewith, whereby the inconvenience, labor, and delay incurred in measuring and marking th e'top at the points where the pipes are to connect, and of conveying the top to and from the factory or workshop, to have the apertures made in the eX- act places and of the desired sizes, are avoided, it being simply necessary to slide the panel y, Aprovided with the required openn g around to the proper point, or to remove one panel and substitute the right one therefor.

To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is a casing consisting of panels of soap-stone or other suitable non-conducting material surrounding the eylindrical portion of the furnace. To the top of this casing is securely tted the lower annular plate or ring, a, of a metal frame, B, its upper ring b being connected with the lower ring a by inclined braces c, braces tl extending from the inside of the upper ring to a central pipe or thimble, O, by which the latter is Supported. rlhe outer periphery of the lower ring a is provided with three upright flanges, e h i, between the two outer ones, e h, of which is formed an annular groove, k, for the reception of the lower ends of a series of tapering panels, D, of soap-Stone or other suitable non-condueting material, while between the two inner flanges h c' is formed a groove, I. The upper ring I) is provided with a iiange., 5, proj eetin g down from its under side, and of a less diameter than the upper portion of the ring. Against this flange 5 rests the inner Surface of the top of each panel D, being secured in this position and snugly against each other. In addition to the flange 5, on the under side of the upper ring b it is provided on its inner side with a horizontal flange, 7,7 which forms a shoulder, 8, against which bears the outer lower ends of a series of tapering panels or plates, E, of soap-stone, the inner upper ends of these plates resting on and being conned within a groove formed between two lianges, 9 10,-projecting horizontally or nearly SQ out from the central pipe or thimble C. Between the top o of the furnace proper and the panels D and E of the sides and upper surface of the top of the soapp stone casing is interposed a casing formed vof separate and independent plates H, and a partition, G., of metal, the upper and lower ends of the plates II being confined in grooves formed within a frame placed inside ofand connected with the outer frame which supports the soap-stone panels E. The metal partition G is connected and supported by braces p proceeding from the Said inner frame, and forms the inner casing of the top of the furnace. When made of metal, the plates Gr are provided with pipes or thimbles i', preferably made in one and the same piece therewith and extending through the soap-stone panels of the outer casing, whereby the pipes for conducting heat tothe various apartments may beconvenientlyconnected therewith. As thimbles of different sizes passing through both the inner and outer rows of panels are provided, and as these panels are capable of being moved around within their frames to any desired point, and as they are also made to be taken out of their frames, any panel having a thiinble of a diameter corresponding to that of a given pipe to be connected may be brought into a position opposite thereto with extreme facility, and the labor and delay heretofore necessitated in measuring and marking the top of the easing at the proper points Where the hot-air pipes are t-o be entered, and of conveying the top to the Workshop or factory to have the several apertures made, are entirely avoided, it being simply necessary to slide the proper panel (with its aperture or thimble already provided) around to the desired point, or to remove one panel and substitute the right one therefor.

I am aware that the tops of thefurnaees have been made so as to shift the hole for the pipe from point to point; and I do not, there ore, claim this feature of myinvention broadly,

mme

What I claiin as new, and desire to secure by Letters Patent, is-

In combination with the body of a furnace, the top easing, constructed as described, and consisting essentially of the rings a b of the metal frame B, provided with the flanges c h i and 5, the panels D and E, of soap-stone or other non-conducting material, the panels E, and plates Gr with the pipe-o1' e11ings, all arranged aud operating substantially as and for the purpose set forth.

Witness my hand this 24th day of June, A. D. 1873.

JOHN MAGEE.

In presence of- N. W. STEARNS, W. J. CAMBRIDGE. 

